Window construction



Nov. 12, 1957 T. HAUCK WINDOW CONSTRUCTION 6 Sheets-Sheet 1 OriginalFiled'Dec. 29, 1949 INVENTOR 1 1 3 a I ATTORNEtS bi T. HAUCK 2,81

e Sheets-Sheet a WINDOW CONSTRUCTION u w W ll &

1 !ln LIIIIII" I h aw u Nov. 12, 1957 Original Filed Dec. 29. 1949 Nov.12, 1957 T. HAUCK 2,812,812

WINDOW CONSTRUCTION Original Filed Dec. 29. 1949 I 6 Sheets-Sheet 4umgymyg I 4 4.93am? Theodore Hams/E- av M, 91W

90 ATTORNEYS 7 T. HAUCK 2,812,812

wmoow CONSTRUCTION Original Filed Dec. 29, 1949 e Sheets-Sheet 5 IINVENTOR Theodore Hauck ATTORNEYS Nov. 12, 1957 T. HAUCK wmnowCONSTRUCTION Original Fiied. Dec. 29, 1949 e Sheets-Sheet e .INVENTOR Tho dore Hauc/z z i 9 a 2 ATTORNEYS Unite WINDOW CONSTRUCTION TheodoreHauck, Amityville, N. Y., assignor to General Bronze Corporation,GardenCity, N. Y.

3 Claims. (Cl. 160-401) This application is a division of. my copendingapplication Serial No. 135,726, filed December 29, 1949 now Patent No.2,703,158.

This invention relates to window construction and more particularly toan improved window unit comprising a conventional double-hung windowcombined in a novel manner with a novel self-storing storm sash andscreen assembly, as well as to certain novel sub-combinations of thewindow unit. The present invention is particularly useful whenincorporated in windows of the type wherein all of the non-glazedportions of the window are made of metal and the preferred embodiment ofthe invention will be described in connection with such windows.However, as the description proceeds it will be apparent that theinvention may be used in connection with wooden frame windows as well,and a modification of the invention particularly useful in wooden framewindows will also be described. Also portions of the present window unitmay be used in conjunction with casement type windows.

It is an object of the present invention to provide an improved assemblyof double-hung window, storm sash and screen that is unusually easy toinstall and may be rapidly secured in place in a suitable buidingopening by relatively unskilled labor. It is another object of theinvention to eliminate the relatively complicated and costly anchoringof the window frame in the building opening that has heretofore beenthought necessary. It is still another object of the invention toprovide a combination window unit of this type having sufiicientventilating flexibility to satisfy the varying desires of differentusers under widely varying atmospheric conditions. It is a furtherobject of the invention to provide such a unit wherein the screen isprotected from exposure during winter weather without removal from theunit. It is another object of the invention to provide a unit having animproved caulking joint and improved heat insulating properties. It isstill another object of the invention to provide in such a unit improvedmeans for inhibiting lateral movement of the storm sash and screen andthereby preventing rattling of these window elements. It is a stillfurther object of the invention to provide in a unit of this typeimproved means for limiting downward movement of the lower sash andimproved means for retaining the window elements in their uppermostposition when desired. Other objects of the invention will be in partobvious and in part pointed out hereafter.

The many objects and advantages of the present invention may best beunderstood and appreciated by reference to the accompanying drawingswhich illustrate a window unit incorporating a preferred embodiment ofthe present invention and wherein:

Figure 1 is a front elevation of a pair of windows incorporating theinvention;

Figure 2 is a vertical section taken on the line 2-2 of States PatentOFigure 1 and showing the general arrangement of the ice window unit andits manner of mounting in the building opening;

Figure 3 is a horizontal section taken on the line 3-3 of Figure 1 andfurther showing the general arrangement of the principal parts of thetwo window units of Figure 1;

Figure 4 is a vertical section taken on the line 44 of Figurel andshowing the spring-biased detent for retaining the storm sashes andscreen in their uppermost positions;

Figure 5 is a horizontal section taken on the line 55 of Figure 4 andshowing one of the track-retaininglugs;

Figure 6 is a vertical section taken on the line6-6 of Figure 4, i. e.,at right angles to the section of Figure 4 and showing the cooperationbetween the spring-biased detent and the notch in the frame of the lowerstorm sash;

Figure 7 is an enlarged detail view of the storm sash notch and detentshown in Figure 6;

Figure 8 is a detail view, similar to Figure 7 but taken on the line 8-8of Figure 4, and showing the configuration of the notches in the framesof the screen and upper storm sash;

Figure 9 is a vertical section taken on the line 9-9 of Figure 3 andillustrating the construction of the safety latch, and also certaindetails of the anti-rattling springs;

Figure 10 is a vertical section taken on the line 10-10 of Figure 9, i.e., at right angles to the section of Figure 9 and showing furtherdetails of the mounting of the antirattling springs;

Figure 11 is a perspective view of a portion of the auxiliary frameshowing the manner of mounting the tracks therein;

Figure 12 is a detail view of one of the screen latches;

Figure 13 is a detail view showing the lower portion of one of the trackmembers in section and a stop for limiting downward movement of theupper storm sash;

Figure 14 is a vertical section through a modified screen and storm sashassembly particularly suited for use with wooden frame windows;

Figure 15 is a front elevation of the structure of Figure 14 showing thedrainage ports, commonly called weep holes and indicating the means foradapting this constructing to window openings of different sizes.

Figure 16 and 17 are vertical sectionstaken on the lines 1616 and 17-17of Figure 15 respectively and further showing the drainage ports andadapting means.

Figure 18 is an approximately vertical section taken on the line 18-18of Figure 16 and further showing the construction of the drainage ports;and

Figure 19 is a perspective detail view of the corner of the frame shownin Figure 15. i

As indicated in the foregoing general description of the drawings, thestructure as shown in Figures 1 and 3 comprises two window units locatedside-by-side. Since thetwo units are of essentially similarconstruction, only one of the. units will be described in detail.

Referringto the drawings and more particularly to Figure 2, the numeral10 generally designates a conventional double-hung metal frame windowcomprising the header 11, jambs 17, upper sash 12, sill 15 and lowersash 14. The conventional window 11) is retained in a building openingby means of what will be designated herein a trim-anchor, generallydesignated 16, which is of generally rectangular shape and includes anoutwardly extending fin 18 that extends outwardly at all sides of thetrim-anchor. Referring to Figures 1 and 3 as well as to Figure 2, thefin 18 provides a nailing strip whereby the trim-anchor 16 may besecured to the peripheral portion 20 of the building opening as by meansof the nails 22. i l i r As indicated in Figures 1 and 3, in cases wheretwo or more window units are to be located side-by-side in a singlewindow opening the portions of the fin 18 located between eachpair ofwindows may be secured to a portion of the conventional window frame 11and thus form a mullion. It is evident that where a single window unitis to be located in a building opening the portion of fin 18 which inFigures 1 and 3 forms part of the mullion will be nailed to a peripheralportion of the building opening which receives the window unit.

Referring now to Figures 2 and 3, the frame 11 of .window is provided atits header and jambs with an outwardly extending flange 24 which issecured to the fin 18 in any suitable manner such as by means of screws26 and in this way the trim-anchor 16 anchors the conventional windowframe 11 and its associated sashes 12 and 14 in the window opening. Thefin 18 is spaced somewhat from the frame 11. At the top of the windowthe trim-anchor 16 is provided with two rearwardly extending spacingmembers 27 and 28 which bear against the upper portion of frame 11 andcooperate with flange 24 and adjacent portions of the fin 18 to definean enclosure 29 filled with an insulating material that serves toinhibit moisture condensation as will be more fully described hereafter.At the sides of the window unit (see Figure 3) the spacing member 28 isomitted and its function is performed by the spacing members 30 thatextend forwardly from the flange 24 to engage fin 18 and defineenclosure 29. The rear face of the fin 18 is provided with theprojections 31 which position the spacing member 30 and thus ensureproper lateral positioning of the window 10 with respect to thetrim-anchor 16.

Reverting to Figure 2, at the bottom of the window unit the sill isprovided with a pair of downwardly extending fins or flanges 32. Aright-angle portion 33 of the trim-anchor 16 extends rearwardly underone of the flanges 32 and upwardly between the flanges to provide meanswhereby the sill 15 is connected to the trim-anchor by means of screws26. As at the top of the window, the space defined by part 33, flanges32 and sill 15 is filled with the insulating material 29. Thetrim-anchor 16 also includes a forwardly and downwardly extending sill34. After installation of the window unit and erection of the buildingfacing 35, the space between the sill 34 and facing 35 is filled with asuitable caulking material 36. In like manner the space between fin 18and the facing 35 at the top of the window unit is filled with thecaulking material 36. Similarly, as shown in Figure 3, the space betweenthe trim-anchor and building facing at the sides of the window is filledwith caulking material 36.

Still referring to Figure 2, the trim-anchor 16 includes in addition tothe fin 18 and spacing members 27 and 28, a forwardly extending fin 37which is provided at the top and sides of the window unit with aninwardly extending flange 38. The fin 37, flange 38, spacing member 27and conventional window frame 11 cooperate to define an auxiliary frame41 wherein a pair of storm sashes and a screen may be mounted.

Referring to Figures 2 and 3, the inner side portions of the auxiliaryframe 41 are provided with the track members 40 and 42 respectivelywhich cooperate with the flange 38 to define the slots 4446-48 and50-52--54 respectively. Slidably mounted within the slots 48 and 54,there is an upper storm sash 56 comprising a hollow rectangular frame 58and a light 60, e. g. a piece of glass, mounted and sealed therein. Asimilarly constructed lower storm sash 61 comprising a hollow 'frame 62and light 63 is slidably mounted in the slots 44 and 50. Slidablymounted between these two storm sashes in the slots 46 and 52 there is ascreen 64 mounted in a hollow frame 65. As further described hereafterthe storm sashes and screen may be vertically moved to give desiredventilation and weather protection under varying winter and summerconditions. In addition to providing slots for reception of the stormsashes and screens, the track members 40 and 42 act as stiffeningmembers for the frame 41 to help prevent buckling of the frame.

In order to permit ready removal of the window sashes 56 and 61 andscreen 64 for cleaning and the like, the track members 40 and 42 aremade in sections that are separately detachable from the frame 41.Referring particularly to Figures 3, 5 and 11, the frame 41 is providedwith a pair of track-member retaining flanges 68 and 70.

The track member 40 is provided with a number of retatable lugs, such asthe lug 72, rotatably mounted on the track member 40 by means of rivets74 which are secured to the lugs. At their ends each of the lugs 72 hasa pair of ears 76 and 78 which are adapted to engage respectively theretaining flanges 68 and 70 to hold the track member securely in placein the frame 41. The inner ends of rivets 74 are flush with the trackmember 40 and provided with kerfs 80 by means of which the rivets 74 andassociated lugs 72 may be rotated with a screw driver to cause the cars76 and 78 to engage or be detached from the retaining flanges 68 and 70.The track member 40 is also provided with a series of projections 81that normally engage the flange 68. These projections facilitate properpositioning of the track member with respect to the frame 41 when thetrack member is inserted in the frame and also prevent undesiredrelative movement of the track member and frame.

The sectionalization of the track members 40 and 42 is best indicated inFigure 11. The track members may be formed of any suitable number ofsections but as shown in Figure 11 comprise a lower section 82 extendingfrom the bottom of the window unit to the point 84 and including two ofthe lugs 72, and an upper section 83 extending from the point 88 to thetop of the window and provided with two of the lugs 72. When it isdesired to remove one of the window elements comprising the two stormsashes and screen from the frame 41, the window elements are moved totheir uppermost position where they are retained in place by mechanismdescribed below. The lugs 72 of the lower section 82 are then rotated todisengage this section of track member 40 from the frame 41 and thecorresponding section of track member 42 is removed. Thereafter one ormore of the window elements may be lowered nad removed from the frame 41as indicated in phantom in Figure 14, by drawing the lower portion ofthe sash inwardly and causing the sash to pivot about its upper edge.The flange 38 of frame 41 prevents the sash from falling outwardly as itis removed. Reverting to Figure 11, it will be noted that the upper endof track section 82 is spaced from the lower end of section 83 by anamount equal to the distance between points 84 and 88 on the frame 41,and that the distance from sill 34 to point 88 is greater than theheight of the window elements. This spacing is to facilitate removal ofthe window elements from the frame.

In order to retain the window elments in their uppermost positions, aspring-biased detent is provided. Referrring to Figures 4, 6, 7 and 8,mounted on the upper outer surface of the track member 40, there is aleaf spring 90 which at its upper end is bent to form a projection 92. Aslot 94 is formed in the track member 40 to permit the projection 92 tobear against the side edges of the frames of the window elements. Asshown in Figure 7, the frame 62 of the lower storm sash 61 is providedwtih a V-notch 96 that is engaged by the projection 92 to hold the stormsash in its uppermost position. The projection 92 is resiliently biasedto enter the notch 96 to retain the sash 61 in its uppermost position.When it is desired to lower this sash downward manual pressure on thewindow element causes the projection 92 to be forced outwardly into thespace between the track member 40 and fin 37 and the sash can thus belowered.

Referring to Figure 8, corresponding notches are Y formed in the frames65 and 58 of the screen 64 and upper storm sash 56 respectively, but thenotches 97 are of a somewhat different configuration from notch 96. Thusnotches 97 have a horizontal upper edge which prevents lowering of theupper storm sash and screen by downward manual pressure on these windowelements until the projection 92 has been Withdrawn from notches 97. Thedetent and notches cooperate to form an interlock between the windowelements which permit lowering of the storm sash 56 and screen 64 onlyafter the storm sash 61 has been moved downwardly to cause theprojections 92 to be retracted.

In order to secure desired ventilation, it is frequently desirable thatthe lower storm sash be positioned a pre determined amount above itslowermost position in contact with sill 34. Referring to Figures 3 and 9of the drawings, this desired positioning of the lower storm sash issecured by means of a retaining pin 100 which passes through the hole102 in the track member 42 and extends across the slot 50 of the trackmember. The pin 100 is mounted on a leaf spring 104 which at its lowerend is secured to the track member 42 by a rivet 106 and thus the pin100 is resiliently urged through the hole 102 into the position shown insolid lines in Figure 9, in which position it engages the lower portionof sash 61. To facilitate withdrawal of the pin 100 from the trackmember, it is provided with a knob 108 that may be manually grasped. Thewithdrawn position of the retaining pin is shown in phantom in Figure 9.It is apparent that when the pin 100 is positioned as shown in the solidlines in Figure 9, it Will limit downward movement of the lower stormsash 61. The pin 100 also serves as a safety latch to prevent injury tothe hands of the user of the window, since the pin must be manuallywithdrawn from the slot 50 in order to lower the sash 61 the last fewinches to its closed position.

In order to inhibit lateral movementof the window elements in theirrespective slots and prevent rattling of the window elements, a numberof specially mounted spring elements are provided. Referring to Figures9 and 10, a normally arcuate thin spring member 110 is mounted on thehollow frame 65 of the screen 64. The hollow frame 65 is provided withthe holes 112 and 114 and the ends of the spring 110 pass through theholes and are curved to ensure that the ends of the spring will remainwithin the interior of the frame 65. The central portion of the spring110 bears against the side of slot 52 and thus inhibits lateral movementof the screen 64 within the slot. It should be noted that the spring 110is loosely mounted with respect to the frame 65, i. e., it is notsecured in fixed relation to the frame but is freely movable, withinlimits, in the holes 112 and 114. It has been found that the loosemounting of the spring 110 is especially effective in reducing rattlingwhile at the same time permitting free movement of the screen 64 withinits slot. In the embodiment here disclosed (see Figure 1) each of thewindow elements is provided with four of the springs 110, i. e., twovertically spaced springs on each side of the window element.

The screen 64 is provided with a pair of spring-biased latches locatedat the inner side of the screen to prevent opening of the screen fromthe outside. As shown in Figure l, the latches 118 and 120 are mountedopposite one another in the sides of screen frame 65 approximatelymid-way between the top and bottom of the screen. Referring to Figure12, each latch comprises a springretaining housing 122 effectivelysecured to the frame 65 and containing a coil spring 124 which bears atone end against the housing and at its other end against a shoulder 126of an axiallyslidable pin128 in such manner as to urge the pin to theright as shown in Figure 12. The pin 128 extends through the side wallof frame 65 in one direction, and in the other direction extends throughthe spring 124 and housing 122 and terminates in a knob 130 that isadapted to be manually grasped. Rightward movement of the pin is limitedby a shoulder 132 of knob that bears against a portion of housing 122.The portion of pin 128 extending beyond frame 65 is adapted to engage(see Figure 11) a hole 134 in the lower section 82 of track member 40.It is evident that spring 124 normally holds pin 128 in hole 134 toretain screen 64 in its lower position and that pin 128 may be manuallywithdrawn by means of knob 130 when it is desired to lraise the screen.The knobs 130 also serve as means whereby the screen may be manuallygasped to raise and lower it.

Referring to Figures 11 and 13, the lower section 82 ot the track memberis provided, near the bottom thereof, with an upset projection 136 thatextends into the slot 48. As best shown in Figure 13, projection 136acts as a stop to limit downward movement of upper sash 56 and preventit from coming in contact with sill 34.

In order to provide a seal between the storm sash and screen thesewindow elements are provided with a number of laterally extendinghorizontal ribs that extend from side to side of the elements. Referringto Figure 2, the frame 65 of screen 64 is provided with a pair of ribs180 and 182 that extend sideways from track member 40 to track member 42and outwardly into contact with frame 58 of upper storm sash 56 whenthese elements are in the position shown in Figure 2, and an inwardlyextending rib 184 that extends sideways between members 40 and 42 andoutwardly to frame 62 of storm sash 63. At the top of sash 63 there is arib 186 extending from track 40 to track 42 and outwardly to frame 65 ofscreen 64 and a spring 188 afiixed to frame 62. The spring 188 alsoextends from track 40 to track 42 and bears against the lower portion ofsash 12 to cause the window elements 56, 64 and 61 to be urged towardone another to ensure desired contact between the ribs and windowelement frames from side to side'of these elements. When the parts arepositioned as shown in Figure 2, ribs 180, 184 and 186 cooperate withframes 58, 62 and 65 respectively to inhibit passage of atmospheric airto the space between the storm window and the conventional window. Thespring 188 is particularly useful as a sealing element in cases wherethe storm sashes are omitted and a single half-screen such as the screen64 is positioned in tracks 46-50.

Near the bottoms of sashes 56 and 62, there are additional ribs 190 and192 which provide hand-holds to facilitate manual movement of theseWindow elements. The bottom of screen 64 has a downwardly and outwardlyextending rib 194 which provides a hand-hold for movement of the screen.A similar rib 196 is formed at the bottom of storm sash 61. It should benoted that a double seal is provided at the bottom of storm sash 61,since the frame 62 bears against sill 15 and the bottom of rib 196 bearsagainst sill 34.

Turning now to Figures 14-19 of the drawings, these figures show atrim-anchor and storm sash-screen assembly essentially the same as thosedescribed previously, but modified for use with Wooden-frame windows.Referring particularly to Figure 14, the numeral designates aconventional, double-hung wooden-frame window having the conventionalframe 152 and sill 154. Secured to the frame 152 there is a trim-anchor156 including a laterally extending fin 158 adapted to be used as anailing strip for securing the trim-anchor 156 to frame 152, and anauxiliary frame within which are mounted, in manner similar to thatpreviously described, an upper storm sash 162, screen 164 and lowerstorm sash 166. The window elements 162--164166 slide in slots ofauxiliary frame 160 as previously described, and can be removedtherefrom if desired. The mode of removal of lower sash 166 is indicatedin phantom in Figure 14.

The construction of the bottom portion of trim-anchor 156 is somewhatdifferent from that of trim-anchor 16. As best shown in Figures 16 and17, the bottom of trimanchor 156 is provided with an expansion rail 168comprising the telescoping upper and lower U-shaped members 170 and 172which are relatively slidable to permit the auxiliary frame of thetrim-anchor to be fitted to previously installed window frames ofvarious heights. As indicated in Figure 19, the side rails of thetrimanchor 156, as originally formed, may extend somewhat below theexpansion rail 168 to form extension 198. When the trim-anchor is fittedto a conventional window frame 152, the expansion rail is adjusted tocause the lower U-shaped member 172 to be positioned against sill 154,and the extensions 198 of the trim-anchor are cut off flush with thebottom of member 172. The extensions 198 are preferably made at leastlong enough to extend somewhat below the expansion rail 168 when it isin its most expanded position.

At the bottom of trim-anchor 156 means are provided for removingcondensed moisture both from the space between the conventional windowand storm sash, and from the interior of the hollow expansion rail.Referring to Figures l18, the under side of U-shaped member 172 isrecessed at one or more points to define, with sill 154, a number ofchannels 174 (in this case two) providing a drainage port or weep holefor removal of any water that may condense between the storm sash andwindow. The member 172 is also provided with the holes 176 which serveas drainage ports for moisture that may condense within expansion rail168. The holes 176, in addition to acting as drainage ports, provide aconvenient opening for insertion of a screw driver or similar tool forthe purpose of adjusting the expansion rail in fitting the trim-anchorto the window frame.

It is apparent from the foregoing description that the present inventionprovides an unusually compact and effective window unit that may be usedwith or without storm sash and screen. That is to say, the trim-anchor16 and conventional window frame form a useful subcombination since thetrim-anchor includes a nailing strip by means of which the combinedstructure may be readily mounted in a building opening without the useof relatively complicated anchoring means that have heretofore beengenerally used. It should be noted that the trim-anchor of theconstruction shown in Figures 1-13 is the sole means for anchoring theconventional window in the window opening. If, after installation of thetrimanchor and conventional window it is found desirable to add stormsashes and screens, these additional window elements may be readilymounted in the auxiliary frame 41 by insertion of the track members 40and 42.

The storm sash and screen assembly described above possesses numerouspractical advantages. By providing separate tracks, for the two stormsashes and the screen, each of these window elements can beindependently adjusted and hence a wide variety of ventilatingconditions secured. Since the screen is mounted between the two stormsashes it may be moved upwardly behind the upper storm sash (see Figure2) during the winter months to prevent clogging with snow. The retainingpin 1% permits positive partial opening of the lower storm sash 61 andalso acts as a safety device to reduce the likelihood of smashing of thefingers by the descending sash, since the knob N3 must be manuallygrasped and withdrawn before the sash 61 can be moved to its lowermostposition. The detent J2 retains the window elements in their uppermostposition and the loosely mounted springs 11!) are exceptionallyeffective in inhibiting lateral movement of the window elements withintheir slots and in preventing rattling of these elements. The heatinsulated enclosure 29 has been found to reduce materially the tendencyof moisture to condense on the various glass surfaces of the windowunit.

It is, of course, to be understood that the foregoing description isintended to be illustrative only and that numerous changes may be madewithout departing from the scope of the invention. Thus it is apparentthat the trim-anchor may be used to support a single conventional windowor may be formed as a unitary structure to support two or more suchwindows. The number of window elements supported within the auxiliaryframe of the trim-anchor may be varied as desired, e. g., the screen orone of the storm sashes may be omitted, or a nonmovable full screen maybe used. The spring-biased detents may be located on only one side ofthe frame or on both sides thereof, and safety latches may be providedat both sides of the window, or additional vertically spaced latches maybe used. The number and arrangement of anti-rattling springs may also bevaried.

Since many embodiments might be made of the present invention and sincemany changes might be made in the embodiment disclosed herein, it is tobe understood that the foregoing description is to be interpreted asillustrative only and not in a limiting sense.

What i claim is:

1. In a window construction, a frame comprising sill, header and jambsarranged in substantially rectangular form, each of said jambs having atleast two sash receiving channels extending longitudinally thereof, afirst half sash and a second half sash, each slidably mounted in arespective pair of channels in said jambs and arranged to slide to theupper and lower halves of said frame with one sash being slidable infront of the other, the first one of said sashes having a locking notchin one of its vertical side stiles, said notch having a substantiallyhorizontally outwardly extending upper face, the second one of saidsashes having a camming notch in one of its side stiles opposite saidlocking notch in said first sash, the upper face of said camming notchinclining upwardly and outwardly and terminating short of the upper endof said stile, a resilient locking and latching member carried by saidframe and extending into the paths of movement of said sashes andengageable with both of said notches and with the upper face of saidcamming notch, whereby when said sashes are in raised positions in theupper half of said frame with their notches in horizontal alignment eachwith the other, said first sash is positively locked against downwardmovement and said second sash is frictionally latched against downwardmovement, and when said second sash is moved downward, the upper face ofsaid camming notch pushes against said resilient member to move it outof engagement with said locking notch in the stile in said first sash sothat the latter will be free to move downwardly, and when said secondsash is positioned in the lower part of said frame with said first sashin the upper part thereof, said first sash will be positively locked.

2. The combination of elements as in claim 1 wherein said resilientmember is a transverse hairpin-loop shaped continuation of the free endof a spring arm, is continuous across its width and extends transverselysubstantially across all of said tracks, said spring arm being wide,long and thin and fixed vertically in cantilever fashion to said frame.

3. The combination of elements as in claim 1 in further combination witha third half-sash, and another pair of sash receiving channelspositioned parallel to the first two pairs in said jambs and in whichsaid third sash is mounted, said third sash having a locking notch inone of its vertical side stiles, said notch having a substantiallyhorizontal outwardly extending upper face and being engageaole by saidlocking and latching member simultaneously along with said notches insaid first and second sashes.

References Cited in the file of this patent UNITED STATES PATENTS892,970 Bagby July 7, 1908 2,575,575 Altwies Nov. 20, 1951

